Installing Hella 500 Lights

The light should come with a relay and a wiring harness and instructions on how to wire them. There will be a wire to ground, a wire to the battery and a wire to the relay inside the engine compartment. In the cab you should have a switch that's wired to the relay.

On my F350, I wired my Warn SBD lights relay to the hot side of the parking lights. That way whenever the parking lights are lit, I can fire up the big lights. Hella's instructions will probably tell you to connect the hot side of the relay to the high beam circuit. Modify 'em to your preferences..